I have been using the E-Z Command DCC Control Centre 36-500 for about two years with no problems, however in the last few days, the responsiveness of the speed control wheel has changed. Now I have to turn it about half way around until the selected loco moves at all (and it then moves very slowly). But then if I then adjust the control wheel position at all (either to increase or decrease speed), the loco picks up speed immediately corresponding to the new control wheel position (i.e. it suddenly charges forward).

I have a E-Z Command Companion 36-501 plugged in at the same time and the control wheel on this works exactly as expected, so I think there can be no issues with the track or with the locomotives, just with the control wheel on the 36-500.

Should I just buy another to replace it, or can I fix it?

P.S. I am sure it has not been taken off and put back in the wrong orientation.

All advice gratefully received.